gluebuddy: Remove deleted project bot for arch-boxes

The project access token expired ~3 months ago and the CI script has
just been switched to using a job token instead[1]. The project bot user
has zero activity so I decided to delete it.

[1] archlinux/arch-boxes@afa85791

roles/gluebuddy/defaults/main.yml

@@ -4,7 +4,6 @@ gitlab_bots:
   - project_10185_bot2
   - project_19591_bot
   - project_19796_bot
-  - project_10177_bot
   - project_57011_bot_12149c4ff92f18dd46696e89f2f3e703
   - project_57074_bot_740552e9ac20aea79fd0f9d34e757397
   - project_10185_bot_6f3a8a11922b9008fcb92024361b10b6